JP2017171452A - Medium winding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medium winding device capable of reducing a current flowing through a motor.SOLUTION: A medium winding device comprises: a delivery motor 21 being a drive source winding a medium P; a control section 10 controlling the delivery motor 21 based on a torque limit value setting an upper limit of output torque of the delivery motor 21; and a delivery side detection section 51 detecting a rotational speed of the delivery motor 21. The control section 10 changes the torque limit value based on the rotational speed detected. In this case, it is preferable that the control section 10 increase the torque limit value when the detected rotational speed is below a first threshold value, and that the control section 10 decrease the torque limit value when the detected rotational speed exceeds a second threshold value larger than the first threshold value.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a medium winding device.

  A printer that is an example of a medium winding device will be described as an example. Some printers are designed to rewind the medium by rotating the roll body in the opposite direction to the feeding direction by a roll motor in order to eliminate the slack generated in the medium between the roll body and the transport drive roller. It is known (see Patent Document 1).

JP 2009-280398 A

  In the media winding device, the output torque of the motor is prepared in case the roll load, that is, the load applied to the motor when rotating the roll body is increased, in order to prevent the roll body from being delayed and slackening in the medium. If set to a high value, the current flowing through the motor will also increase.

  An object of the present invention is to provide a medium winding device that can reduce the current flowing through a motor.

  The medium winding device of the present invention detects a rotation speed of the motor, a motor that is a drive source for winding the medium, a control unit that controls the motor based on a torque limit value that defines an upper limit of the output torque of the motor And a controller, wherein the controller changes the torque limit value based on the detected rotational speed.

  According to this configuration, since the torque limit value is changed based on the detected rotation speed, the operation of the motor with an unnecessarily large output torque is suppressed. Thereby, the electric current which flows into a motor can be reduced.

  In this case, it is preferable that the control unit decrease the torque limit value when the detected rotation speed exceeds a threshold value.

  According to this configuration, the output torque becomes small after the detected rotational speed exceeds the threshold value. For this reason, when the motor is rotating at high speed, it is possible to prevent the motor from operating with an unnecessarily large output torque.

  In this case, it is preferable that the control unit increases the torque limit value when the detected rotation speed falls below a threshold value.

  According to this configuration, the output torque can be reduced until the detected rotation speed falls below the threshold value. For this reason, it is suppressed that the motor operates with an unnecessarily large output torque. In addition, since the output torque increases after the detected rotational speed falls below the threshold value, the slackness of the medium can be reduced even when the slackness of the medium occurs due to the decrease in the rotational speed of the motor. .

  In this case, the control unit increases the torque limit value when the detected rotation speed falls below the first threshold value, and the control unit exceeds the second threshold value at which the detected rotation speed is larger than the first threshold value. In this case, it is preferable to reduce the torque limit value.

  According to this configuration, after the detected rotation speed exceeds the second threshold value, the output torque decreases until it falls below the first threshold value. In addition, since the output torque increases after the detected rotational speed falls below the first threshold value, the slack of the medium can be reduced even if the medium is slack due to a decrease in the rotational speed of the motor. Can do. Furthermore, as a result of the increase in the output torque, the rotation speed of the motor increases. When the detected rotation speed exceeds the second threshold value, the output torque decreases again. Therefore, it is possible to reduce the slack generated in the medium and to suppress the operation of the motor with an unnecessarily large output torque.

  In this case, the apparatus further includes a feeding unit that has a motor and a roll body around which the medium is wound, and a winding unit that winds the medium fed from the roll body. When the wound medium is rewound to the feeding unit, it is preferable to change the torque limit value based on the detected rotation speed.

  According to this configuration, when the medium wound up by the winding unit is rewound to the feeding unit, the current flowing through the motor can be reduced.

1 is a diagram illustrating a schematic configuration of a recording apparatus according to an embodiment of the present invention. FIG. 6 is a control block diagram relating to a medium feeding mechanism of the recording apparatus. It is a figure for demonstrating the fluctuation | variation of a roll load. It is a figure for demonstrating the reference example of the control method of a feeding motor. It is a figure for demonstrating the control method of the delivery motor of this embodiment.

  Hereinafter, a recording apparatus 1 which is an embodiment of a medium winding apparatus of the present invention will be described with reference to the accompanying drawings.

  A schematic configuration of the recording apparatus 1 will be described with reference to FIG. The recording apparatus 1 prints an image on the medium P by an inkjet method while feeding the medium P. The recording apparatus 1 includes a medium feeding mechanism 2, a platen 3, a suction fan 4, a recording unit 5, a drying unit 6, and a support frame 7 that supports them.

  The medium feeding mechanism 2 feeds the long medium P from the feeding side roll body 101 to the winding side roll body 103 by a roll-to-roll method. The feeding-side roll body 101 is obtained by winding the medium P around a feeding-side core 101a (for example, a paper tube). The winding-side roll body 103 is a medium P that has been fed from the feeding-side roll body 101 and on which an image has been printed by the recording unit 5 and has been wound around the winding-side core 103a. As the medium P, for example, various materials such as paper, film, and cloth are used. The maximum width, maximum diameter (diameter), and maximum weight of the feeding-side roll body 101 that can be set in the recording apparatus 1 are, for example, 64 inches (about 1.6 m), 250 mm, and 80 kg, respectively. The medium feeding mechanism 2 includes a feeding unit 11, a feeding unit 12, and a winding unit 13.

  The feeding side roll body 101 is set in the feeding unit 11. The feeding portion 11 includes a feeding side support portion 14 and a feeding motor 21 (see FIG. 2). The feeding side support part 14 supports the feeding side roll body 101 rotatably. The feeding motor 21 is a drive source that rotates the feeding-side roll body 101. As the feeding motor 21, for example, a DC (Direct Current) motor can be used. As the feeding motor 21 rotates in the forward or reverse direction, the feeding-side roll body 101 rotates in the feeding direction D <b> 1 so that the medium P is fed out from the feeding-side roll body 101. Further, when the feeding motor 21 rotates in the forward and reverse directions, the feeding-side roll body 101 rotates in the rewinding direction D <b> 2 so that the medium P is rewound onto the feeding-side roll body 101.

  The feeding unit 12 feeds the medium P fed from the feeding-side roll body 101 toward the winding unit 13. The feed unit 12 includes a feed roller 16 and a feed motor 22 (see FIG. 2). The feed roller 16 includes a drive roller 18 and a driven roller 19. The driving roller 18 and the driven roller 19 send the medium P sandwiched between them. The feed motor 22 is a drive source that rotates the drive roller 18. As the feed motor 22, for example, a DC motor can be used. The medium P is fed in the feed direction D3 as the feed motor 22 rotates forward and backward. Further, when the feed motor 22 rotates in the forward and reverse directions, the medium P is sent in the reverse feed direction D4 which is the reverse direction to the feed direction D3.

  The winding unit 13 winds the medium P that has been sent in a roll shape. The winding unit 13 includes a winding side support unit 15 and a winding motor 23 (see FIG. 2). The winding side support portion 15 rotatably supports the winding side core 103a. The leading end of the medium P is attached to the winding side core 103a. The winding motor 23 is a drive source that rotates the winding-side core 103a. As the winding motor 23, for example, a DC motor can be used. When the winding motor 23 rotates forward or backward, the winding side core 103a rotates in the winding direction D5, and the medium P is wound around the winding side core 103a. Thereby, the winding side roll body 103 is formed. When the take-up motor 23 rotates in the forward and reverse directions, the take-up core 103a rotates in a rewind direction D6 opposite to the take-up direction, and the medium P taken up by the take-up core 103a is returned.

  The platen 3 is provided on the downstream side of the feed path Pa with respect to the feed roller 16. A plurality of suction holes 26 penetrating vertically are formed in the platen 3. The suction fan 4 is provided below the platen 3. When the suction fan 4 is operated, the suction hole 26 has a negative pressure, and the medium P on the platen 3 is sucked and held. Ink is ejected from a recording head 27 described later to the medium P sucked and held on the platen 3.

  The recording unit 5 records an image on the medium P. The recording unit 5 includes a recording head 27, a carriage 28, and a carriage moving mechanism 29. The recording head 27 ejects ink onto the medium P adsorbed on the upper surface of the platen 3. A recording head 27 is mounted on the carriage 28. The carriage moving mechanism 29 reciprocates the carriage 28 in a direction that intersects the feeding direction D3 of the medium P.

  The drying unit 6 is provided on the downstream side of the recording unit 5 in the feeding path Pa of the medium P from the feeding side roll body 101 to the winding side roll body 103. The drying unit 6 includes an aluminum plate 31 and a tube heater 32 provided on the back surface of the aluminum plate 31. When the tube heater 32 generates heat, the drying of the medium P is promoted when the medium P to which ink is applied passes through the surface of the aluminum plate 31.

  A tension bar 34 is provided on the support frame 7. The tension bar 34 is swingably supported by the bar support shaft 35. The tension bar 34 is in contact with the medium P that has passed through the drying unit 6 and applies tension to the medium P. Thereby, the medium P is wound up by the winding unit 13 in a state where an appropriate tension is applied to the medium P.

  Based on FIG. 2, a control configuration related to the medium feeding mechanism 2 of the recording apparatus 1 will be described. The recording apparatus 1 includes a control unit 10, a feeding driver 41, a feeding driver 42, a winding driver 43, a feeding side detection unit 51, a feeding detection unit 52, and a winding side detection unit 53. .

  The control unit 10 performs overall control of each unit of the recording apparatus 1. Although not shown, the control unit 10 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a PROM (Programmable ROM), an ASIC (Application Specific Integrated Circuit), It has a bus.

  Further, a host device (not shown) such as a personal computer is connected to the control unit 10 so as to be communicable. When receiving a recording job from the host device, the control unit 10 controls each unit of the recording device 1 based on the received recording job. Thereby, the recording apparatus 1 repeatedly performs the dot formation operation and the feeding operation alternately. Here, the dot forming operation is an operation of forming dots on the medium P by ejecting ink from the recording head 27 while moving the carriage 28 in a direction crossing the feeding direction D3, and is also called main scanning. The feeding operation is an operation for feeding the medium P in the feeding direction D3 and is also referred to as sub-scanning.

  The feeding driver 41, the feeding driver 42, and the winding driver 43 drive the feeding motor 21, the feeding motor 22, and the winding motor 23, respectively, based on a PWM (Pulse Width Modulation) signal output from the control unit 10.

  The feeding side detection unit 51, the feeding detection unit 52, and the winding side detection unit 53 detect the rotation speed of the feeding motor 21, the rotation speed of the feeding motor 22, and the rotation speed of the winding motor 23, respectively. As the feeding-side detection unit 51, for example, a rotary encoder provided in the feeding motor 21 can be used. The rotation position of the feeding motor 21 is represented as the count value of the output pulse from the feeding side detection unit 51, and the amount of change in the rotation position of the feeding motor 21 per unit time becomes the rotation speed of the feeding motor 21. The same applies to the feed detection unit 52 and the winding side detection unit 53.

  The recording apparatus 1 configured as described above can rewind the medium P wound around the winding unit 13 to the feeding unit 11 based on an instruction received by an operation panel (not shown). At this time, the control unit 10 rotates the winding-side roll body 103 in the rewinding direction D6, the medium P is fed in the reverse feeding direction D4 by the feed roller 16, and the feeding-side roll body 101 is moved in the rewinding direction D2. The winding motor 23, the feeding motor 22 and the feeding motor 21 are controlled so as to rotate. At this time, the control unit 10 performs PID control on the feed motor 22 based on a speed table in which the speed changes in the order of acceleration, constant speed, and deceleration.

  When the medium P wound up by the winding unit 13 is rewound to the feeding unit 11, the control unit 10 delays the rotation of the feeding side roll body 101 with respect to the feeding speed of the medium P by the feeding roller 16, Alternatively, the feeding motor 21 is controlled based on the torque limit value so that the feeding-side roll body 101 does not pull the medium P too much.

  This torque limit value determines the upper limit of the output torque of the feeding motor 21. That is, the control unit 10 compares, for example, a control value obtained by PID control based on a deviation between the target speed of the feeding motor 21 and the current speed with a torque limit value. When the control value does not exceed the torque limit value, the control unit 10 outputs the duty value of the PWM signal based on the control value to the feeding driver 41. On the other hand, when the control value exceeds the torque limit value, the control unit 10 outputs the duty value of the PWM signal based on the torque limit value to the feeding driver 41. Thereby, the upper limit of the output torque of the feeding motor 21 is limited to a value based on the torque limit value.

  By the way, as shown in FIG. 3, the roll load, that is, the load (torque) applied to the feeding motor 21 when rotating the feeding side roll body 101 is caused by the eccentricity of the feeding side roll body 101. It fluctuates according to the rotation period of 101. For this reason, if the torque limit value is set to a value corresponding to the average value of the fluctuating roll load, the output torque of the feeding motor 21 is less than the roll load at the timing when the roll load increases. Become. In this case, the rotation of the feeding-side roll body 101 is delayed, and the medium P between the feeding-side roll body 101 and the feed roller 16 becomes slack.

  Therefore, in the control method of the feeding motor 21 which is a reference example of the present invention, the torque limit value is set to a value (first limit value L1) larger than the value corresponding to the maximum value of the fluctuating roll load.

  With reference to FIG. 4, the reference example of the control method of the feeding motor 21 is demonstrated concretely. In the example shown in FIG. 4, the output torque of the feeding motor 21 based on the first limit value L1 exceeds the roll load even when the roll load increases. For this reason, the state in which the medium P between the feeding-side roll body 101 and the feeding roller 16 is stretched is maintained, and the feeding motor 21 operates in accordance with the speed of the feeding motor 22. As described above, the control unit 10 controls the feeding motor 21 based on the torque limit value set to the first limit value L1, so that the medium P is rewound stably.

  The roll load varies depending on the rotation speed of the feeding side roll body 101 and the radius of the feeding side roll body 101, but in the example shown in FIG. 4 and FIG. Treated as having no effect. Further, in the example shown in FIG. 4 and FIG. 5 described later, the feeding motor 21 always outputs torque based on the torque limit value. That is, the control unit 10 outputs the duty value of the PWM signal based on the torque limit value, not the control value, to the feeding driver 41.

  By the way, when the medium P is fed out from the feeding-side roll body 101, the feeding motor 21 is more than the roll load so that a desired tension is applied to the medium P between the feeding-side roll body 101 and the feeding roller 16. Outputs a small torque. On the other hand, when the medium P is rewound onto the feeding-side roll body 101, the feeding motor 21 outputs a torque larger than the roll load as described above. For this reason, the feeding motor 21 outputs a larger torque when the medium P is rewound than when the medium is fed. Since a current proportional to the output torque flows through the feeding motor 21, the current flowing through the feeding motor 21 is larger when the medium P is rewound than when the medium is fed out.

  Moreover, in the above reference example, the control unit 10 sets the torque limit value to the same value (first limit value L1) as when the roll load is large even when the roll load is small. When the roll load is small, an unnecessarily large torque is output. For this reason, the current flowing through the feeding motor 21 further increases.

  As a result, particularly when the medium P is rewound for a long time, the heat generation amount of the feeding motor 21 exceeds the heat generation limit amount, and it becomes necessary to take time to cool the feeding motor 21. In the case where the medium P is rewound over a long period of time, for example, after the printing for one delivery roll body 101 is performed, the user checks the print quality from the winding unit 13. The case where the medium P for one roll body is continuously rewound to the supply part 11 can be mentioned.

  Therefore, in the present embodiment, the control unit 10 changes the torque limit value according to the rotational speed of the feeding motor 21 detected by the feeding side detection unit 51 so as to reduce the current flowing through the motor. Yes. That is, the control unit 10 sets the torque limit value to the first limit value L1 when the rotation speed of the feeding motor 21 falls below the first threshold value Va. In addition, when the rotational speed of the feeding motor 21 exceeds the second threshold value Vb that is larger than the first threshold value Va, the control unit 10 sets the torque limit value to a second limit value L2 that is smaller than the first limit value L1. Set to. In other words, the control unit 10 increases the torque limit value when the winding delay of the medium P occurs, but the winding delay of the medium P by the feeding-side roll body 101 does not occur. To reduce the torque limit value.

  As the torque limit value, for example, the control unit 10 calculates the torque calculated from the set value of the tension applied to the medium P between the feeding-side roll body 101 and the feed roller 16, and the torque calculated from the measured value of the roll load. Set the sum of and. In this case, the control unit 10 changes the torque limit value by changing the tension setting value according to the detected rotation speed of the feeding motor 21.

  The control unit 10 performs such torque limit value change control during constant speed control of the feed motor 22. During acceleration control and deceleration control of the feed motor 22, as in the case of the reference example, the control unit 10 sets the torque limit value to the first limit value L1 regardless of the detected rotation speed of the feeding motor 21. Set to.

  With reference to FIG. 5, the control method of the feeding motor 21 of the present embodiment will be specifically described. In the example shown in FIG. 5, the rotation speed of the feeding motor 21 exceeds the second threshold value Vb at the timing when the feed motor 22 is switched to constant speed control, that is, when the torque limit value change control is started. . For this reason, the control unit 10 changes the torque limit value from the first limit value L1 to the second limit value L2. As a result, the output torque of the feeding motor 21 is reduced, but at this time, the output torque is larger than the roll load, so the rotation speed of the feeding motor 21 does not decrease.

  Timing t1 in FIG. 5 indicates a timing at which the rotation speed starts to increase after the rotation speed of the feeding motor 21 once decreases because the roll load temporarily increases and exceeds the output torque. Since the rotational speed of the feeding motor 21 is temporarily reduced, the medium P between the feeding-side roll body 101 and the feeding roller 16 is slackened. Thereafter, the rotational speed of the feeding motor 21 is reduced as the roll load decreases. Since it increases, the slack of the medium P is eliminated. After the slack of the medium P is eliminated, the medium P is in a stretched state, and the rotation speed of the feeding motor 21 is stabilized. Thus, when the state where the roll load has increased is temporary, the control unit 10 controls the feeding motor 21 with the torque limit value set to the second limit value L2.

  Timing t2 and timing t4 in FIG. 5 indicate the timing at which the rotation speed of the feeding motor 21 continues to decrease and falls below the first threshold value Va because the roll load increases and exceeds the output torque. At this time, the control unit 10 changes the torque limit value from the second limit value L2 to the first limit value L1. As a result, the output torque becomes larger than the roll load, and the rotational speed of the feeding motor 21 continues to decrease temporarily due to inertia, but thereafter, the rotational speed of the feeding motor 21 increases.

  Timing t3 and timing t5 in FIG. 5 indicate the timing at which the increased rotation speed of the feeding motor 21 exceeds the second threshold value Vb after the torque limit value is changed from the second limit value L2 to the first limit value L1. ing. At this time, the control unit 10 changes the torque limit value from the first limit value L1 to the second limit value L2. As a result, the output torque becomes smaller than the roll load, and the rotational speed of the feeding motor 21 continues to increase temporarily due to inertia, but thereafter the rotational speed of the feeding motor 21 decreases.

  Thus, when the state where the roll load increases continues to some extent, the control unit 10 switches the feeding motor 21 while repeatedly switching the torque limit value between the first limit value L1 and the second limit value L2. Control.

As described above, the recording apparatus 1 according to the present embodiment includes the feeding motor 21, the control unit 10, and the feeding side detection unit 51. The feeding motor 21 is a drive source that takes up the medium P. The control unit 10 controls the feeding motor 21 based on a torque limit value that determines the upper limit of the output torque of the feeding motor 21. The feeding side detection unit 51 detects the rotation speed of the feeding motor 21. Then, the control unit 10 changes the torque limit value based on the detected rotation speed of the feeding motor 21.
According to this configuration, since the torque limit value is changed based on the detected rotation speed of the feeding motor 21, it is possible to suppress the feeding motor 21 from operating with an unnecessarily large output torque. Thereby, the electric current which flows into the feeding motor 21 can be reduced. Accordingly, the amount of heat generated by the feeding motor 21 can be reduced. In particular, when the medium P is rewound for a long time, the amount of heat generated by the feeding motor 21 exceeds the heat generation limit. Can do.

In the recording apparatus 1 of the present embodiment, the control unit 10 decreases the torque limit value when the detected rotation speed of the feeding motor 21 exceeds the second threshold value Vb.
According to this configuration, the output torque becomes small after the detected rotation speed of the feeding motor 21 exceeds the second threshold value Vb. For this reason, when the feeding motor 21 rotates at a high speed, the feeding motor 21 is prevented from operating with an unnecessarily large output torque.

In the recording apparatus 1 of the present embodiment, the control unit 10 increases the torque limit value when the detected rotation speed of the feeding motor 21 falls below the first threshold value Va.
According to this configuration, the output torque can be reduced until the detected rotation speed of the feeding motor 21 falls below the first threshold value Va. For this reason, operation of the feeding motor 21 with an unnecessarily large output torque is suppressed. Further, after the detected rotation speed of the feeding motor 21 falls below the first threshold value Va, the output torque increases. Therefore, even when the medium P is slackened due to a decrease in the rotation speed of the feeding motor 21. The slack of the medium P can be reduced.

In the recording apparatus 1 of the present embodiment, the control unit 10 increases the torque limit value when the detected rotation speed of the feeding motor 21 falls below the first threshold value Va. Further, when the detected rotation speed of the feeding motor 21 exceeds the second threshold value Vb that is larger than the first threshold value Va, the control unit 10 decreases the torque limit value.
According to this configuration, after the detected rotation speed of the feeding motor 21 exceeds the second threshold value Vb, the output torque decreases until it falls below the first threshold value Va. Further, after the detected rotation speed of the feeding motor 21 falls below the first threshold value Va, the output torque increases. Therefore, even when the medium P is slackened due to a decrease in the rotation speed of the feeding motor 21. The slack of the medium P can be reduced. Furthermore, as a result of the increase in the output torque, the rotation speed of the feeding motor 21 increases, and when the detected rotation speed of the feeding motor 21 exceeds the second threshold value Vb, the output torque decreases again. Accordingly, it is possible to reduce the slack generated in the medium P and to suppress the operation of the feeding motor 21 with an unnecessarily large output torque.

The recording apparatus 1 of the present embodiment further includes a feeding unit 11 and a winding unit 13. The feeding unit 11 has a feeding motor 21 and a feeding-side roll body 101 around which the medium P is wound is set. The winding unit 13 winds up the medium P that has been fed from the feeding-side roll body 101. Then, the control unit 10 changes the torque limit value based on the detected rotational speed of the feeding motor 21 when the medium P wound up by the winding unit 13 is rewound by the feeding unit 11.
According to this configuration, the current flowing through the feeding motor 21 can be reduced when the medium P taken up by the winding unit 13 is rewound to the feeding unit 11.

The feeding motor 21 is an example of a “motor”. The feeding side detection unit 51 is an example of a “detection unit”. The first threshold value Va and the second threshold value Vb are examples of “threshold values”. The feeding side roll body 101 is an example of a “roll body”.
It goes without saying that the present invention is not limited to the above-described embodiment, and various configurations can be employed without departing from the spirit of the present invention. For example, this embodiment can be changed into the following forms.

  The control unit 10 is not limited to a configuration in which the torque limit value is changed between the first limit value L1 and the second limit value L2 according to the detected rotation speed of the feeding motor 21. It may be changed between two or more values. The control unit 10 acquires a relational expression between the torque limit value and the rotation speed of the feeding motor 21 in advance, and substitutes the value obtained by substituting the detected rotation speed of the feeding motor 21 into the relational expression. The torque limit value may be changed by setting the torque limit value.

  The control unit 10 may perform torque limit value change control not only during constant speed control of the feed motor 22 but also during acceleration control or deceleration control of the feed motor 22.

  The present invention is applicable not only when the medium P is rewound by the feeding motor 21 but also when the medium P is wound by the winding motor 23. That is, the control unit 10 may change the torque limit value of the winding motor 23 based on the rotational speed of the winding motor 23 detected by the winding side detection unit 53.

  The application example of the medium winding device of the present invention is not limited to an ink jet recording device, and may be, for example, a dot impact recording device or an electrophotographic recording device. Furthermore, the present invention is not limited to a recording apparatus, and for example, a drying apparatus that performs a drying process on a medium while feeding the medium, a surface treatment apparatus that performs a surface treatment on a medium while feeding the medium, and the medium winding apparatus of the present invention. May be applied. Further, the apparatus is not limited to an apparatus that performs such processing on a medium, and may be an apparatus that simply winds up a medium.

  DESCRIPTION OF SYMBOLS 1 ... Recording device, 2 ... Medium feeding mechanism, 10 ... Control part, 11 ... Feeding part, 12 ... Feeding part, 13 ... Winding part, 21 ... Feeding motor, 22 ... Feeding roller, 23 ... Winding motor, 41 ... Feeding driver, 42 ... feeding driver, 43 ... winding driver, 51 ... feeding side detection unit, 52 ... feeding detection unit, 53 ... winding side detection unit, 101 ... feeding side roll body, 103 ... winding side roll body, D2 ... Rewind direction, D4 ... Reverse feed direction, D6 ... Rewind direction, P ... Medium

Claims (5)

A motor that is a drive source for winding the medium;
Based on a torque limit value that defines an upper limit of the output torque of the motor, a control unit that controls the motor;
A detection unit for detecting the rotation speed of the motor,
The control unit changes the torque limit value based on the detected rotation speed.   The medium winding device according to claim 1, wherein the control unit decreases the torque limit value when the detected rotation speed exceeds a threshold value.   The medium winding device according to claim 1, wherein the control unit increases the torque limit value when the detected rotation speed falls below a threshold value. The control unit increases the torque limit value when the detected rotation speed falls below a first threshold value,
The medium winding device according to claim 1, wherein the control unit reduces the torque limit value when the detected rotation speed exceeds a second threshold value that is larger than the first threshold value. . A feeding unit having the motor and set with a roll body around which the medium is wound;
A winding unit that winds up the medium fed from the roll body, and
The said control part changes the said torque limit value based on the detected said rotational speed, when the said medium wound up by the said winding-up part is rewound by the said delivery part. Item 5. The medium winding device according to any one of Items 1 to 4.

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